Some philosophers, such as Jeremy Bentham, Baruch Spinoza, and Descartes, have hypothesized that the sensations of pain and pleasure are part of a continuum.
There is strong evidence of biological connections between the neurochemical pathways used for the perception of both pain and pleasure, as well as other psychological rewards.
Read more about Pain And Pleasure: Perception of Pleasure, Psychology of Pain and Pleasure (Reward-punishment System), Opioid and Dopamine Systems in Pain and Pleasure, Evolutionary Hypotheses For The Relationship Between Pain and Pleasure
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“Pain and pleasure are infectious. It depresses us to be much with those who have suffered long and are still suffering; it refreshes us to be with those who have suffered little and are enjoying themselves. But it is good for us to be depressed now and then.”
—Samuel Butler (1835–1902)